Malicious PDF — malware analysis report

Static analysis result for SHA-256 efacb88d5949648e…

MALICIOUS

PDF

89.8 KB Created: 2021-07-01 18:33:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 2e9fc8c2c118a2bfb44b16d6a7853844 SHA-1: 82ab75d26fbfd930f1a08f3e30797de599680141 SHA-256: efacb88d5949648ed8d638d182768fb499d00aef7b4d5d6d9e731d1035e504af
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs that point to compromised WordPress sites, likely intended to lure users into downloading further malicious content or visiting phishing pages. The presence of multiple distinct hosts and the use of 'utm_term' parameters suggest an attempt at SEO manipulation to increase visibility of the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/167972809887dd6fc62918e640f76379/97865786185.pdf In PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607e76ec2680f---49699703370.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/472045a32c191af3de09c8d77b0d19b6/27132843864.pdfIn PDF document text
    • https://bancodevida.com/bancodevida/admin/images/image/file/14371965078.pdfIn PDF document text
    • http://fructusartis.com/i/File/17651487757.pdfIn PDF document text
    • http://jandebruijn.com/uploadimages/files/bedawidunubojo.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/1609b3df915646---6325445219.pdfIn PDF document text
    • http://accessibilite-salle-eau.com/ckfinder/userfiles/files/tebewatagal.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/78fb542a003f6157f133600af7617cbf/padedusugebani.pdfIn PDF document text
    • https://gionggiacam.com/ckfinder/userfiles/files/35617832797.pdfIn PDF document text
    • http://amandatravel.com/userfiles/file/22417269329.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/78rvqmg8jpsuh6s6n6r0mu18m1/vamazovulinufopepoj.pdfIn PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/p66g5vd0sdea3t14kk9au6nfgt/kenivitulatesiwegosa.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160887163478dd---gixajemumigulesojidogi.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/160825562dd983---48876096950.pdfIn PDF document text
    • http://loadcell.vn/Images_upload/files/dipalipazidokaxiwemeb.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/a377f1e68fac67fec015f3bd9d6f1af3/vodarogetinefib.pdfIn PDF document text
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/ce7a37e1b853a228b19c14f8450bb25f/lenaxiwibaroxobetekoso.pdfIn PDF document text
    • https://jodhpurtravels.com/nbloom/fckuploads/file/22928234589.pdfIn PDF document text
    • https://nikoljski.com/ckfinder/userfiles/files/jowozogudoxiwidojoma.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160961beca0ba7---fosedexetuwefupoxug.pdfIn PDF document text
    • http://russkiivopros.com/images/FCKeditor/file/nodamujejegimedabukezun.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce44fa5feb---xokej.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=all+dogs+go+to+heaven+2+full+movie+online+freePDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fb57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB57 17128 bytes
SHA-256: c962ac59785badc12eb013a47b3803bdb2403c9f93f9010175e66cd32a4d11f2
font_01_sfnt_off000127e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127E2 11068 bytes
SHA-256: 6f22eeb45760432622f15db795ff9a191f9177c073c82face3994b66d3980409
font_02_sfnt_off00014157.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14157 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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